Log In Log In  |  Checkout   |  40 item(s)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
3 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x UC7000 HONEYWELL UNDER THE COUNTER WATER FILTER (WHITE, LARGE)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x Panel 1/2" 6710M-44TM Digital Flow Meter count up Gallon 115V
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
2 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 720, Feed Water Adapter with Needle Valve
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$855.45
Specials Log InCreate Account Checkout  Shopping Cart40 item(s)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
3 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x UC7000 HONEYWELL UNDER THE COUNTER WATER FILTER (WHITE, LARGE)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x Panel 1/2" 6710M-44TM Digital Flow Meter count up Gallon 115V
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
2 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 720, Feed Water Adapter with Needle Valve
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$855.45

ATU TEE Union Connector Quick Connect QC Fitting [ATU]

$3.50

ATU TEE Union Connector Quick Connect QC Fitting



* ATU TEE Union Connector, Quick Connect

* Please choose size from the selection box below. Both numbers are tubing OD Outside Diameter. First number is Tee double side and second number is the single side. (Pipe sizes can be confusing even for the experienced user. Pipe size is not the actual outside or inside diameter of the pipe but is the industry accepted designation. If you have any question please email us first.)
* 1/4" Tube OD x 1/4" Tube OD ATU0404
* 3/8" Tube OD x 1/4" Tube OD ATU0604
* 3/8" Tube OD x 3/8" Tube OD ATU0606
* 1/2" Tube OD x 3/8" Tube OD ATU0706
* 1/2" Tube OD x 1/2" Tube OD ATU0707


* Water & foods use: Products are manufactured from safe, non-toxic materials meeting the requirements of the US FDA, ERAS, ANSI/NSF-51,61, and SK Zert. Our products are widely used in water purification, food/beverage, and pneumatic systems.

* Function & Quality: Provides quick and convenient assembly-saving time & expense.

* Collet Design: Our unique oval collet design is superior and more practical, and is an improvement welcomed by our world wide customers in all industries.

* Additional Applications: Beyond water and food use, fittings can be used with air, gases, vacuum, & liquids. All connections can be assembled & disassembled repeatedly. A broad range of sizes covers a broad scope of applications.

* We carry different fittings in variation of sizes: 1/4", 3/8", or 1/2" adapters, connectors, fittings, or valves.  Most are not listed online, to avoid confusion to majority of RO system customers.  

* Send us a message with specification, intended application, and image of your setup or old fitting  to check if we have what you need. 

Available Options:

Size Combination:

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